Each type of power amplifier has advantages and disadvantages. By employing different amplifier types for each driver, AIR10 loudspeakers use the respective strengths of Class D and Class A/B amplifiers to provide optimal response throughout the speaker's frequency range. A 500W (continuous), Class D amplifier powers the 10-inch low-frequency driver, providing efficient, clean low end when you need it. A 200W (continuous), Class AB amplifier powers the 1-inch high-frequency driver, delivering a natural sounding, AIR-y high end. The combination can deliver up to 121 dB SPL of sweet, clear sound between 55 Hz and 20 kHz.